.TH std::feclearexcept 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::feclearexcept \- std::feclearexcept

.SH Synopsis
   Defined in header <cfenv>
   int feclearexcept( int excepts );  \fI(since C++11)\fP

   Attempts to clear the floating-point exceptions that are listed in the bitmask
   argument excepts, which is a bitwise OR of the floating point exception macros.

.SH Parameters

   excepts - bitmask listing the exception flags to clear

.SH Return value

   0 if all indicated exceptions were successfully cleared or if excepts is zero.
   Returns a non-zero value on error.

.SH Example



// Run this code

 #include <cfenv>
 #include <cmath>
 #include <iostream>

 // #pragma STDC FENV_ACCESS ON

 volatile double zero = 0.0; // volatile not needed where FENV_ACCESS is supported
 volatile double one = 1.0;  // volatile not needed where FENV_ACCESS is supported

 int main()
 {
     std::feclearexcept(FE_ALL_EXCEPT);
     std::cout <<  "1.0/0.0 = " << 1.0 / zero << '\\n';
     if (std::fetestexcept(FE_DIVBYZERO))
         std::cout << "division by zero reported\\n";
     else
         std::cout << "division by zero not reported\\n";

     std::feclearexcept(FE_ALL_EXCEPT);
     std::cout << "1.0/10 = " << one / 10 << '\\n';
     if (std::fetestexcept(FE_INEXACT))
         std::cout << "inexact result reported\\n";
     else
         std::cout << "inexact result not reported\\n";

     std::feclearexcept(FE_ALL_EXCEPT);
     std::cout << "sqrt(-1) = " << std::sqrt(-1) << '\\n';
     if (std::fetestexcept(FE_INVALID))
         std::cout << "invalid result reported\\n";
     else
         std::cout << "invalid result not reported\\n";
 }

.SH Possible output:

 1.0/0.0 = inf
 division by zero reported
 1.0/10 = 0.1
 inexact result reported
 sqrt(-1) = -nan
 invalid result reported

.SH See also

   fetestexcept determines which of the specified floating-point status flags are set
   \fI(C++11)\fP      \fI(function)\fP
   C documentation for
   feclearexcept
